REST GET recordset Response

I have developed a pure node.js REST application server that connects to a MSSQL DB and uses endpoints to request employee records.

I am receiving duplicate records back when I request all employee records or when I request one employee record using a REST GET request. The response has both a recordsets and recordset section. Is this correct and if it is, how do I prevent duplicate records?

You help would be greatly appreciated.

exports.executeSql = function (sql, callback) {
    var conn = new sqlDb.ConnectionPool(settings.dbConfig);
    conn.connect()
        .then(function () {
            var req = new sqlDb.Request(conn);
            req.query(sql)
                .then(function (recordset) {
                    callback(recordset);
                })
                .catch(function (err) {
                    console.log(err);
                    callback(null, err);
                });
        })
        .catch(function (err) {
            console.log(err);
            callback(null, err);
        });
};

This is the JSON response I get back when requesting employee record where employee_number = 100

{
  "recordsets": [
    [
      {
        "RECORD_KEY": "951112558721130050",
        "EMPLOYEE_NUMBER": "100",
        "FIRST_NAME": "SAMPLE CLERK",
        "LAST_NAME": null,
      }
    ]
  ],
  "recordset": [
    {
      "RECORD_KEY": "951112558721130050",
      "EMPLOYEE_NUMBER": "100",
      "FIRST_NAME": "SAMPLE CLERK",
      "LAST_NAME": null,
    }
  ],
  "output": {},
  "rowsAffected": [
    1
  ]
}

via joey.coyle